Early reports from BBC indicate that a white van drove off the road and slammed into a number of pedestrians. It is not clear how many people were injured, though Daily Star suggests that an estimated 15 to 20 people were hit, and there have also been reports of a stabbing as well.

Will Heaven, managing editor for British political magazine The Spectator, has been tweeting from the scene:

Black can driver shouts that there has been "terrorist attack". Have seen two casualties – one on pavement, one edge of road.

London Bridge is currently on lockdown, and emergency services are on site.

The incident comes a day before Ariana Grande was set to return to Manchester, in order to hold a benefit show after her pop concert was attacked by a terrorist last month. It is not yet clear what the nature of the incident is, or if British authorities are treating this as a terror attack.

UPDATE – 6:35 p.m. EST: Both President Trump and British Prime Minister Theresa May have been briefed about the incident:

BREAKING: Downing Street says Prime Minister Theresa May in contact with officials and is being updated on London Bridge incident.

UPDATE — 11:00 p.m. EST: British authorities have confirmed that six people were killed in the attacks, and that three terror suspects were taken down outside of Borough Market. Police have also said that the suspects’ suicide vests were fake.